Simplex 7100 Series provides fully mechanical primary or auxiliary pushbutton access control by exterior combination, while allowing free egress at all times by interior thumbturn. Deadbolt models must be manually relocked. Deadlocking latch models automatically relock each time the door closes.This fully mechanical lock elimates the material and labor expense of battery replacements, has a single access-code and is programmed via the keypad without removing the lock from the door.